For those struggling with hit-takers, go full auto hard. If you're not hitting them (i.e. they're not taking their hit), it can't possibly be overkill can it? I've found that people have a much harder time ignoring a full mag compared to ignoring three sensible shots.
Oh dont get me started on blind firing, we had a nob open up on full auto blinding firing... Shot the head marshal 20 times from about 5m and had the cheek to deny it!